Pharmacokinetics and Safety Study of Tapentadol for Postsurgical Pain in Children and Adolescents

Inclusion Criteria: * Parent(s) or the legal guardian(s) of the patient signed an informed consent document indicating that they understand the purpose of the study, the risks and benefits of the procedures required for the study and give permission for their child to participate in the study * Physical status rated as I or II on the American Society of Anesthesiologists (ASA) rating scale * Patient is alert, oriented, able to follow commands, able to understand the study requirements and procedures, and able to communicate intelligibly with the health care provider (taking into account his/her age) * As per investigator's medical evaluation, patient is able to drink and tolerate oral fluids and medication * Patient has a postoperative pain intensity score \>=4 on the McGrath Color Analog Scale (CAS) as a result of a scheduled surgical procedure or if in the investigator's clinical judgment (ie, investigator judgment relying on standard of care rather than the McGrath CAS), the patient has a pain level that the standard of care following the surgical procedure (which reliably produces moderate to severe pain) requires opioid treatment Exclusion Criteria: * History of seizure disorder or epilepsy, or serotonin syndrome, or mild or moderate traumatic brain injury, stroke, transient ischemic attack, or brain neoplasm within 1 year of screening, or severe traumatic brain injury within 15 years of screening, or any traumatic or hypoxic brain injury resulting in ongoing sequelae suggesting transient changes in consciousness * Moderate to severe renal or hepatic impairment * Requires concomitant use of sedatives, other than those used during surgery * Has received dextromethorphan within 2 days before the scheduled study drug administration.